Can you help me to correct it?

Is this for a letter declining a job offer?

@ AlpheccaStars
Yeah, It is to my boss whom I need to send. I already sent him 2 detailed emails for which he responded so gently and helped me personally. But, I don't want to continue my job here anymore. The email should be in a way that I thank him and asking sorry for turning down the offer which happened because of him.

Thanks!

I regret to inform you that I must turn down your gracious job offer. I appreciate what you have done for me, and cannot thank you enough. I will keep in touch in the future, and wish you all the best.

That was so nice

Thank you for helping me out!

Best,

@AlpheccaStars:

Could you help me to add two more lines to it? I should say that I took the decision because of the mental pressure I was getting from my family. It should be in a way that even though I wish to continue my work, my family circumstances holds me back.?

Thank you so much!

I regret to inform you that I must turn down your gracious job offer because of personal circumstances within my family. I appreciate what you have done for me, and cannot thank you enough. I will keep in touch in the future, and wish you all the best.

That was so polite and great

Thank you so much!